lead

rednet.open("back")



while true do
  if gps.locate() then
    location = {gps.locate()}
  elseif throwError then
    print("ALERT: GPS tower out of range. Turtle will travel to last known location, at X: " .. x .. ", Y: " .. y .. ", Z: " .. z)
  end
  if gps.locate() then
    throwError = true
  else
    throwError = false
  end
  rednet.send(id, location)
end